using System;

using System.Collections.Specialized;

using System.IO;

using System.Net;

using System.Reflection;

using System.Text;

namespace CommonSD

{

    public class HttpPostHelper

    {

        public static string Post(string url, string postData)

        {

            return Post(url, postData, "application/x-www-form-urlencoded");

        }

        public static string Post(string url, string postData, string contentType)

        {

            HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);

            request.ContentType = contentType;

            request.Method = "POST";

            request.Timeout = ;

            byte[] bytes = Encoding.UTF8.GetBytes(postData);

            request.ContentLength = bytes.Length;

            Stream writer = request.GetRequestStream();

            writer.Write(bytes, , bytes.Length);

            writer.Close();

            HttpWebResponse response = (HttpWebResponse) request.GetResponse();

            StreamReader reader = new StreamReader(response.GetResponseStream() ?? throw new InvalidOperationException(), Encoding.UTF8);

            string result = reader.ReadToEnd();

            response.Close();

            return result;

        }

        public static string Post(string url, string postData, string userName, string password)

        {

            HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);

            request.ContentType = "text/html; charset=UTF-8";

            request.Method = "POST";

            string usernamePassword = userName + ":" + password;

            CredentialCache credentialCache =

                new CredentialCache {{new Uri(url), "Basic", new NetworkCredential(userName, password)}};

            request.Credentials = credentialCache;

            request.Headers.Add("Authorization",

                "Basic " + Convert.ToBase64String(new ASCIIEncoding().GetBytes(usernamePassword)));

            byte[] bytes = Encoding.UTF8.GetBytes(postData);

            request.ContentLength = bytes.Length;

            Stream writer = request.GetRequestStream();

            writer.Write(bytes, , bytes.Length);

            writer.Close();

            HttpWebResponse response = (HttpWebResponse) request.GetResponse();

            StreamReader reader = new StreamReader(response.GetResponseStream() ?? throw new InvalidOperationException(), Encoding.ASCII);

            string result = reader.ReadToEnd();

            response.Close();

            return result;

        }

        //static CookieContainer cookie = new CookieContainer();

        /// <summary>

        ///

        /// </summary>

        /// <param name="url">请求的servlet地址，不带参数</param>

        /// <param name="postData"></param>

        /// <returns>请求的参数，key=value&key1=value1</returns>

        public static string doHttpPost(string url, string postData)

        {

            HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);

            SetHeaderValue(request.Headers, "Content-Type", "application/json");

            SetHeaderValue(request.Headers, "Accept", "application/json");

            SetHeaderValue(request.Headers, "Accept-Charset", "utf-8");

            request.Method = "POST";

            request.Timeout = ;

            byte[] bytes = Encoding.UTF8.GetBytes(postData);

            request.ContentLength = bytes.Length;

            Stream writer = request.GetRequestStream();

            writer.Write(bytes, , bytes.Length);

            writer.Close();

            HttpWebResponse response = (HttpWebResponse) request.GetResponse();

            StreamReader reader = new StreamReader(response.GetResponseStream() ?? throw new InvalidOperationException(), Encoding.UTF8);

            string result = reader.ReadToEnd();

            response.Close();

            return result;

        }

        /// <summary>

        /// 偶发性超时时试看看

        /// </summary>

        /// <param name="url"></param>

        /// <param name="postData"></param>

        /// <returns></returns>

        public static string HttpPostForTimeOut(string url, string postData)

        {

            //System.Diagnostics.Stopwatch watch = new System.Diagnostics.Stopwatch();

            //watch.Start();

            GC.Collect();

            HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);

            request.Method = "POST";

            request.ContentType = "application/json";

            //request.ContentLength = Encoding.UTF8.GetByteCount(postDataStr);

            //int a = Encoding.UTF8.GetByteCount(postData);

            request.Timeout =  *  * ;

            ServicePointManager.Expect100Continue = false;

            ServicePointManager.DefaultConnectionLimit = ;

            request.KeepAlive = false;

            request.ProtocolVersion = HttpVersion.Version10;

            Stream myRequestStream = request.GetRequestStream();

            StreamWriter myStreamWriter = new StreamWriter(myRequestStream, Encoding.GetEncoding("utf-8")); //如果JSON有中文则是UTF-8

            myStreamWriter.Write(postData);

            myStreamWriter.Close(); //请求中止,是因为长度不够,还没写完就关闭了.

            HttpWebResponse response = (HttpWebResponse) request.GetResponse();

            //watch.Stop();  //停止监视

            //TimeSpan timespan = watch.Elapsed;  //获取当前实例测量得出的总时间

            //System.Diagnostics.Debug.WriteLine("打开窗口代码执行时间：{0}(毫秒)", timespan.TotalMinutes);  //总毫秒数

            Stream myResponseStream = response.GetResponseStream();

            StreamReader myStreamReader = new StreamReader(myResponseStream ?? throw new InvalidOperationException(), Encoding.GetEncoding("utf-8"));

            string registerResult = myStreamReader.ReadToEnd();

            myStreamReader.Close();

            myResponseStream.Close();

            return registerResult;

        }

        public static void SetHeaderValue(WebHeaderCollection header, string name, string value)

        {

            var property =

                typeof(WebHeaderCollection).GetProperty("InnerCollection",

                    BindingFlags.Instance | BindingFlags.NonPublic);

            if (property != null)

            {

                if (property.GetValue(header, null) is NameValueCollection collection) collection[name] = value;

            }

        }

    }

}